Stalling in reverse

[euromade]

I have a funny issue with my 87 5.0 TBI.  When I put it in reverse it stalls on me, every time, unless I play with the gas pedal.  When in D i have absolutelly no issue!  It starts fine, it idles fine, it does not stall on me when I stop at a red light.
Any ideas.  I'd like to use this thing to tow my boat, but with this stalling issue it would be almost impossible to use it at a boat ramp.
Thanks,
New parts installed in the past month or so:
- Fuel filter
- air filter
- plugs and wires
- fuel pump/sending unit.

[Redneckchevy]

check ur vacuum lines

[76_Scottsdale]

i'm assuming he has a 700r4 so he doesn't have vacuum lines that control the tranny but check all the vacuum lines on/around the motor to make sure you don't have a leak

[VileZambonie]

Check the throttle body base gasket. With the engine idling mist some carb claean at the base of the throttle body and see if the engine speed changes.

[DnStClr]

If you don't lose rpms at a stop light the timing is probably ok. When was the tranny fluid changed last? A tranny shop can tell you if you have a bad torque converter. I would expect it to have low power and  hesitation problems with a vacuum leak.